RFR: 8349686: [s390x] C1: Improve Class.isInstance intrinsic [v5]

[Amit Kumar]

> s390x implementation for Class.isInstance intrinsic. 
> 
> Tier1 test on release & fastdebug vm are clean with flag: `-XX:-UseSecondarySupersCache -XX:+UseSecondarySupersTable -XX:+VerifySecondarySupers -XX:+StressSecondarySupers`. 
> 
> Benchmark results will be updated soon.

Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:

  wip: comments from Lutz

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23535/files
  - new: https://git.openjdk.org/jdk/pull/23535/files/33d5cbe3..fdd979a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23535&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23535&range=03-04

  Stats: 13 lines in 2 files changed: 2 ins; 3 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/23535.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23535/head:pull/23535

PR: https://git.openjdk.org/jdk/pull/23535